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Old 20th December 2010, 20:41   #1
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Unhappy Strange rear speaker problem with Kenwood Excelon x794

I'm facing a strange issue with my Kenny x794 head unit. Ive always used this unit with a 4 channel amp and thus the internal amp was always kept off from day 1. The front and rear pre-outs went to the PDX 4 channel and then it powered the front and back speakers. Then few of months ago i deided to do a semi-active setup at the front. So i needed all 4 channels from the amp and so the HU rear pre-out was disconnected from the amp, and disconnected both rear speakers from the amp and rear speakers were not being used since then.

The previous weekend i decided to connect the rear speakers to the HU directly, and i wired the rear speaker wires to the HU. Then i turned on the internal amplifier expecting the rear speakers to sing along, but it didn't. I resetted the HU, tried all possible settings in the HU like DSP off, TA off, Position ALL etc.. but all in vain. Finally I checked to see if the rear speakers were connected and both are.

Now i don't have the faintest of the idea as to why the rear speakers are not producing any kind of sound! I want the rear speakers to sing but i can't use the 4 channel amp anymore as i don't want to disturb the front setup. What is wrong? Or is it this way with this HU? I re checked the manual and got nothing.
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Old 21st December 2010, 11:24   #2
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Default Re: Strange rear speaker problem with Kenwood Excelon x794

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Originally Posted by Sankar View Post
The previous weekend i decided to connect the rear speakers to the HU directly, and i wired the rear speaker wires to the HU. Then i turned on the internal amplifier expecting the rear speakers to sing along, but it didn't. .
Are you sure you have turned on the internal amplifier? Maybe you could just rest the system.

The other thing to condier is if anything is connected to the rear RCA outputs sometimes the HU might switch off speaker outs if RCA outs are connected.
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Old 21st December 2010, 12:15   #3
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Default Re: Strange rear speaker problem with Kenwood Excelon x794

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“Built in AMP”
Selecting “OFF” turns off the built-in amplifier.
Turning off the built-in amplifier improves the
quality of the sound from Preout.
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Old 21st December 2010, 19:03   #4
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Default Re: Strange rear speaker problem with Kenwood Excelon x794

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Originally Posted by navin View Post
Are you sure you have turned on the internal amplifier? Maybe you could just rest the system.

The other thing to condier is if anything is connected to the rear RCA outputs sometimes the HU might switch off speaker outs if RCA outs are connected.
Yes i turned on the built in amp, i did it repeatedly when no sound came from the rear speakers. I reset the HU too. Default setting of the built in amp is on, and after i reset the HU the built in amp was being shown as 'on', but still no sound :-( The rear RCA output is not connected anywhere and its disconnected from the HU. Now the only thing to do is to disconnect and reconnect the battery lead to see if makes any difference.

(DAMN!!!! Wait a sec, i got a flash! Will update soon!)

The wiring was done as DIY using crimp terminals and its tight and properly insulated, and no error code is displayed and its not going into protect mode.

Quote:
Originally Posted by greenhorn View Post
Attachment 471870
“Built in AMP”
Selecting “OFF” turns off the built-in amplifier.
Turning off the built-in amplifier improves the
quality of the sound from Preout.
Yes, but i need the rear fill, want to re-try it. Turned the Amp on but zilch.
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Old 21st December 2010, 20:07   #5
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Default Re: Strange rear speaker problem with Kenwood Excelon x794

Quote:
Originally Posted by navin View Post
The other thing to condier is if anything is connected to the rear RCA outputs sometimes the HU might switch off speaker outs if RCA outs are connected.
Quote:
Originally Posted by Sankar View Post
(DAMN!!!! Wait a sec, i got a flash! Will update soon!)
The ground loop thing done on the RCA pre-outs of my HU for the sub out channel since the day subwoofer was installed. Thanks to a so called installer from Tvm who shorted the sub out.

So Navin ji's point about HU sensing RCA out being connected and switching off the speaker out got me thinking about the loop around the RCA out prolly making the HU think that its connected. So i disconnected the ground loop around rear rca out and checked for sound from rear out... but still same old story I even disconnected the front RCAs, but still nothing. I'm fed up, got no idea what to do next, change the HU? Wonder if its a feature or fault.. lol

Last edited by Sankar : 21st December 2010 at 20:11.
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Old 21st December 2010, 20:28   #6
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Default Re: Strange rear speaker problem with Kenwood Excelon x794

go step by step
1. disconnect your amp completely, connect your rear speakers to HU directly and check whether they work
2. disconnect rear speakers and connect two of the front speakers to HU directly and check whether they work
3. If all is ok, connect rear speakers and two front speakers to the HU and check whether they work.
If they don't work at first attempt in any step, check connections and settings in HU.
Once you are sure, that speakers are working with HU, disconnect front speakers from HU and try connecting the amp again.
Have a feeling that problem may be with power amp in your HU.
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